TIGER/Line (.bw1;.rt1)

TIGER or Topologically Integrated Geographic Encoding and Referencing, is a vector file format used by the US census bureau for the delivery of land data. It describes features such as roads, rivers and lakes in an ASCII text based file.

Expected file extensions can include *.BW1, *.RT1.

Future releases are planned to be in the OGC spec GML format.